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  2. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone , and in water with a hydrophone .

  3. Sound exposure - Wikipedia

    en.wikipedia.org/wiki/Sound_exposure

    Sound exposure, denoted E, is defined by = (), where the exposure is being calculated for the time interval between times t 0 and t 1; p(t) is the sound pressure at time t, usually A-weighted for sound in air.

  4. Sound - Wikipedia

    en.wikipedia.org/wiki/Sound

    Sound pressure is the difference, in a given medium, between average local pressure and the pressure in the sound wave. A square of this difference (i.e., a square of the deviation from the equilibrium pressure) is usually averaged over time and/or space, and a square root of this average provides a root mean square (RMS) value.

  5. Sound energy density - Wikipedia

    en.wikipedia.org/wiki/Sound_energy_density

    Sound energy density, denoted w, is defined by = where p is the sound pressure;; v is the particle velocity in the direction of propagation;; c is the speed of sound.; The terms instantaneous energy density, maximum energy density, and peak energy density have meanings analogous to the related terms used for sound pressure.

  6. Orders of magnitude (pressure) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)

    Pressure due to direct impact of a strong breeze (~28 mph or 45 km/h) [27] [28] [31] 120 Pa Pressure from the weight of a U.S. quarter lying flat [32] [33] 133 Pa 1 torr ≈ 1 mmHg [34] ±200 Pa ~140 dB: Threshold of pain pressure level for sound where prolonged exposure may lead to hearing loss [citation needed] ±300 Pa ±0.043 psi

  7. Sound level meter - Wikipedia

    en.wikipedia.org/wiki/Sound_level_meter

    This movement of the diaphragm, i.e. the sound pressure (unit pascal, Pa), is converted into an electrical signal (unit volt, V). While describing sound in terms of sound pressure, a logarithmic conversion is usually applied and the sound pressure level is stated instead, in decibels (dB), with 0 dB SPL equal to 20 micropascals.

  8. Absolute threshold of hearing - Wikipedia

    en.wikipedia.org/wiki/Absolute_threshold_of_hearing

    The threshold of hearing is generally reported in reference to the RMS sound pressure of 20 micropascals, i.e. 0 dB SPL, corresponding to a sound intensity of 0.98 pW/m 2 at 1 atmosphere and 25 °C. [3] It is approximately the quietest sound a young human with undamaged hearing can detect at 1 kHz. [4]

  9. Sound power - Wikipedia

    en.wikipedia.org/wiki/Sound_power

    Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time. [1] It is defined [2] as "through a surface, the product of the sound pressure, and the component of the particle velocity, at a point on the surface in the direction normal to the surface, integrated over that surface."